Perpendicular magnetic recording head and perpendicular magnetic recording and reproducing system
AssigneeHitachi, Ltd.
InventorsHisashi Kimura, Kazuhiro Nakamoto, Yoshiaki Kawato, Nobuo Yoshida
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Abstract
There is provided a perpendicular magnetic recording and reproducing system in which the overwrite erase ratio of a perpendicular magnetic head has been improved to prevent the deterioration of an overwrite property. In the perpendicular magnetic head, a third magnetic pole composed of a soft magnetic layer is formed on the leading side of a recording magnetic pole via a non-magnetic layer, thereby reducing magnetic interference from magnetization on a medium with the recording magnetic pole and preventing the deterioration of the overwrite property.
Claims12
A perpendicular magnetic head comprising:
- a first magnetic pole;
- a second magnetic pole magnetically coupled to the first magnetic pole;
- a coil for exciting the first magnetic pole;
- an air bearing surface opposing a magnetic recording medium;
- and
- a third magnetic pole provided on a leading side of the first magnetic pole at least on the air bearing surface, the third magnetic pole being separated from the first and second magnetic poles by a non-magnetic layer.
A perpendicular magnetic head comprising:
- a write element;
- a read element;
- and
- an air bearing surface for opposing the write element and the read element to a magnetic recording medium,
- the read element having a pair of magnetic shields composed of upper and lower shields, a magneto-resistive effect film disposed between the pair of magnetic shields, and a pair of electrodes for applying a current to the magneto-resistive effect film,
- the write element having a first magnetic pole, a second magnetic pole magnetically coupled to the first magnetic pole, a coil for exciting the first magnetic pole, a third magnetic pole provided on a leading side of the first magnetic pole, the third magnetic pole being separated from the first and second magnetic poles by a non-magnetic layer.
A perpendicular magnetic recording and reproducing system comprising:
- a magnetic recording medium having a soft under layer and a recording layer;
- a magnetic head having an air bearing surface opposing the magnetic recording medium;
- and
- driving means for rotating the magnetic recording medium in a fixed direction,
- the magnetic head having a first magnetic pole, a second magnetic pole magnetically coupled to the first magnetic pole, a coil for exciting the first magnetic pole, and a third magnetic pole provided upstream of the first magnetic pole in the direction of the rotation of the magnetic recording medium at least on the air bearing surface, the third magnetic pole being separated from the first and second magnetic poles by a non-magnetic layer.
Dependencies are inferred from the claim text.